IOTA/IOTA-ES occultation update for (9) Metis / UCAC4 563-021868 event on 2023 Sep 25, 19:01 UT Visible from S Australia Summary ------- On 2023 Sep 25 UT, the 169.6 km diameter asteroid (9) Metis will occult a 12.3 mag star in the constellation Orion for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.19 mag to 10.45 mag (the magnitude of the asteroid) for at most 9.890 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2023 Sep 25, 18:58 - 2023 Sep 25, 19:04 * geocentric midpoint of event [JD]: 2460213.29280484 * magnitude of target star: 12.27 * magnitude drop [mag]: 0.19 * estimated maximum duration [s]: 9.890 * Moon: 82 % sunlit, 136° distance * Sun: 93° distance * rough path description: S Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 348 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.002", 83°) * approx speed of asteroid's shadow [km/s]: 17.1473 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 563-021868 by 9 Metis on 2023 Sep 25 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 111 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -57 23 34 .. .. .. -57 19 8 .... 112 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -56 50 52 .. .. .. -56 46 28 .... 112 59 59 -58 29 42 18 58 39.0 0 43 -23 .. .. .. -56 18 13 .. .. .. -56 13 52 .... 113 59 59 -57 55 57 18 58 39.1 1 42 -23 .. .. .. -55 45 39 .. .. .. -55 41 20 0.85 114 59 59 -57 22 19 18 58 39.4 2 41 -23 -59 45 35 -55 13 11 -59 50 52 -55 8 54 1.24 116 0 0 -56 48 49 18 58 39.8 3 40 -23 -59 10 28 -54 40 51 -59 15 42 -54 36 36 1.40 117 0 0 -56 15 28 18 58 40.3 3 39 -23 -58 35 33 -54 8 40 -58 40 42 -54 4 28 1.49 118 0 0 -55 42 19 18 58 41.0 4 38 -23 -58 0 50 -53 36 41 -58 5 56 -53 32 30 1.55 119 0 0 -55 9 23 18 58 41.8 5 38 -23 -57 26 22 -53 4 53 -57 31 24 -53 0 44 1.58 120 0 0 -54 36 41 18 58 42.8 6 37 -23 -56 52 10 -52 33 18 -56 57 8 -52 29 12 1.61 121 0 0 -54 4 15 18 58 43.9 7 36 -22 -56 18 15 -52 1 59 -56 23 10 -51 57 55 1.64 122 0 0 -53 32 6 18 58 45.2 7 35 -22 -55 44 39 -51 30 56 -55 49 30 -51 26 53 1.65 123 0 0 -53 0 15 18 58 46.7 8 34 -22 -55 11 23 -51 0 10 -55 16 11 -50 56 9 1.67 124 0 0 -52 28 44 18 58 48.2 9 33 -22 -54 38 29 -50 29 42 -54 43 13 -50 25 44 1.68 125 0 0 -51 57 34 18 58 50.0 10 33 -22 -54 5 57 -49 59 34 -54 10 39 -49 55 38 1.69 126 0 0 -51 26 45 18 58 51.9 10 32 -21 -53 33 50 -49 29 47 -53 38 28 -49 25 52 1.70 127 0 0 -50 56 20 18 58 53.9 11 31 -21 -53 2 7 -49 0 22 -53 6 42 -48 56 29 1.71 128 0 0 -50 26 19 18 58 56.1 12 30 -21 -52 30 51 -48 31 20 -52 35 23 -48 27 29 1.71 129 0 0 -49 56 43 18 58 58.4 13 29 -20 -52 0 2 -48 2 42 -52 4 31 -47 58 53 1.72 130 0 0 -49 27 34 18 59 0.8 13 28 -20 -51 29 41 -47 34 29 -51 34 7 -47 30 42 1.72 131 0 0 -48 58 52 18 59 3.4 14 28 -20 -50 59 50 -47 6 42 -51 4 13 -47 2 56 1.73 132 0 0 -48 30 38 18 59 6.2 15 27 -19 -50 30 28 -46 39 22 -50 34 49 -46 35 38 1.73 133 0 0 -48 2 54 18 59 9.1 16 26 -19 -50 1 38 -46 12 30 -50 5 56 -46 8 47 1.74 134 0 0 -47 35 39 18 59 12.1 16 25 -18 -49 33 20 -45 46 6 -49 37 35 -45 42 25 1.74 135 0 0 -47 8 55 18 59 15.2 17 24 -18 -49 5 34 -45 20 12 -49 9 47 -45 16 32 1.74 136 0 0 -46 42 42 18 59 18.5 18 23 -17 -48 38 22 -44 54 47 -48 42 32 -44 51 10 1.75 137 0 0 -46 17 2 18 59 21.9 18 22 -17 -48 11 43 -44 29 54 -48 15 52 -44 26 18 1.75 138 0 0 -45 51 55 18 59 25.4 19 21 -16 -47 45 40 -44 5 32 -47 49 46 -44 1 58 1.75 139 0 0 -45 27 21 18 59 29.0 20 20 -16 -47 20 12 -43 41 43 -47 24 16 -43 38 10 1.76 140 0 0 -45 3 21 18 59 32.8 20 20 -15 -46 55 20 -43 18 27 -46 59 22 -43 14 55 1.76 141 0 0 -44 39 57 18 59 36.6 21 19 -15 -46 31 5 -42 55 44 -46 35 5 -42 52 13 1.76 142 0 0 -44 17 8 18 59 40.6 21 18 -14 -46 7 27 -42 33 35 -46 11 25 -42 30 6 1.77 143 0 0 -43 54 55 18 59 44.6 22 17 -14 -45 44 26 -42 12 1 -45 48 23 -42 8 33 1.77 144 0 0 -43 33 18 18 59 48.8 23 16 -13 -45 22 4 -41 51 2 -45 25 59 -41 47 35 1.77 145 0 0 -43 12 18 18 59 53.1 23 15 -12 -45 0 21 -41 30 38 -45 4 14 -41 27 12 1.77 146 0 0 -42 51 56 18 59 57.4 24 14 -12 -44 39 16 -41 10 51 -44 43 8 -41 7 26 1.78 147 0 0 -42 32 11 19 0 1.8 24 13 -11 -44 18 51 -40 51 40 -44 22 41 -40 48 17 1.78 148 0 0 -42 13 5 19 0 6.4 25 12 -10 -43 59 6 -40 33 7 -44 2 55 -40 29 44 1.78 149 0 0 -41 54 38 19 0 10.9 25 11 -10 -43 40 1 -40 15 11 -43 43 48 -40 11 49 1.78 150 0 0 -41 36 50 19 0 15.6 25 10 -9 -43 21 37 -39 57 53 -43 25 23 -39 54 32 1.78 151 0 0 -41 19 41 19 0 20.4 26 9 -8 -43 3 54 -39 41 12 -43 7 38 -39 37 53 1.79 152 0 0 -41 3 11 19 0 25.2 26 8 -7 -42 46 52 -39 25 10 -42 50 35 -39 21 52 1.79 153 0 0 -40 47 22 19 0 30.0 27 7 -7 -42 30 31 -39 9 47 -42 34 13 -39 6 29 1.79 154 0 0 -40 32 12 19 0 35.0 27 6 -6 -42 14 53 -38 55 3 -42 18 33 -38 51 46 1.79 155 0 0 -40 17 44 19 0 39.9 27 5 -5 -41 59 56 -38 40 58 -42 3 35 -38 37 42 1.79 156 0 0 -40 3 56 19 0 44.9 28 4 -5 -41 45 41 -38 27 33 -41 49 20 -38 24 17 1.79 157 0 0 -39 50 49 19 0 50.0 28 3 -4 -41 32 9 -38 14 47 -41 35 46 -38 11 32 1.80 158 0 0 -39 38 23 19 0 55.1 28 2 -3 -41 19 19 -38 2 42 -41 22 56 -37 59 27 1.80 159 0 0 -39 26 38 19 1 0.3 28 0 -2 -41 7 12 -37 51 16 -41 10 48 -37 48 3 1.80 160 0 0 -39 15 35 19 1 5.4 28 359 -1 -40 55 48 -37 40 31 -40 59 23 -37 37 18 1.80 161 0 0 -39 5 14 19 1 10.6 29 358 -1 -40 45 7 -37 30 27 -40 48 41 -37 27 14 1.80 162 0 0 -38 55 34 19 1 15.8 29 357 0 -40 35 9 -37 21 3 -40 38 43 -37 17 51 1.80 163 0 0 -38 46 37 19 1 21.1 29 356 1 -40 25 55 -37 12 20 -40 29 28 -37 9 8 1.80 164 0 0 -38 38 21 19 1 26.3 29 355 2 -40 17 23 -37 4 17 -40 20 56 -37 1 6 1.80 165 0 0 -38 30 48 19 1 31.5 29 354 3 -40 9 36 -36 56 56 -40 13 8 -36 53 45 1.81 166 0 0 -38 23 57 19 1 36.8 29 353 3 -40 2 32 -36 50 16 -40 6 3 -36 47 6 1.81 167 0 0 -38 17 48 19 1 42.1 29 352 4 -39 56 11 -36 44 17 -39 59 42 -36 41 7 1.81 168 0 0 -38 12 21 19 1 47.3 29 351 5 -39 50 34 -36 39 0 -39 54 5 -36 35 50 1.81 169 0 0 -38 7 37 19 1 52.5 29 350 6 -39 45 41 -36 34 23 -39 49 12 -36 31 14 1.81 170 0 0 -38 3 36 19 1 57.8 29 349 7 -39 41 32 -36 30 29 -39 45 2 -36 27 19 1.81 171 0 0 -38 0 17 19 2 3.0 29 348 7 -39 38 7 -36 27 15 -39 41 37 -36 24 6 1.81 172 0 0 -37 57 41 19 2 8.1 29 346 8 -39 35 26 -36 24 43 -39 38 55 -36 21 34 1.81 173 0 0 -37 55 47 19 2 13.3 28 345 9 -39 33 28 -36 22 53 -39 36 58 -36 19 44 1.81 174 0 0 -37 54 36 19 2 18.4 28 344 10 -39 32 15 -36 21 44 -39 35 44 -36 18 35 1.81 175 0 0 -37 54 7 19 2 23.5 28 343 11 -39 31 45 -36 21 17 -39 35 14 -36 18 8 1.81 176 0 0 -37 54 21 19 2 28.6 28 342 11 -39 31 59 -36 21 31 -39 35 28 -36 18 22 1.81 177 0 0 -37 55 18 19 2 33.6 27 341 12 -39 32 57 -36 22 26 -39 36 26 -36 19 17 1.81 178 0 0 -37 56 57 19 2 38.5 27 340 13 -39 34 38 -36 24 4 -39 38 8 -36 20 54 1.81 179 0 0 -37 59 19 19 2 43.4 27 339 14 -39 37 4 -36 26 22 -39 40 33 -36 23 13 1.81 180 0 0 -38 2 23 19 2 48.3 26 338 15 -39 40 13 -36 29 22 -39 43 42 -36 26 13 1.82 -179 0 0 -38 6 9 19 2 53.1 26 337 15 -39 44 5 -36 33 3 -39 47 35 -36 29 53 1.82 -178 0 0 -38 10 38 19 2 57.8 26 336 16 -39 48 42 -36 37 25 -39 52 12 -36 34 15 1.82 -177 0 0 -38 15 49 19 3 2.5 25 335 17 -39 54 2 -36 42 28 -39 57 32 -36 39 18 1.82 -176 0 0 -38 21 42 19 3 7.1 25 334 18 -40 0 5 -36 48 12 -40 3 36 -36 45 2 1.82 -175 0 0 -38 28 17 19 3 11.6 24 333 18 -40 6 52 -36 54 37 -40 10 23 -36 51 27 1.82 -174 0 0 -38 35 34 19 3 16.0 24 332 19 -40 14 21 -37 1 43 -40 17 53 -36 58 32 1.82 -173 0 0 -38 43 33 19 3 20.4 24 332 20 -40 22 34 -37 9 30 -40 26 7 -37 6 18 1.82 -172 0 0 -38 52 13 19 3 24.6 23 331 21 -40 31 30 -37 17 57 -40 35 3 -37 14 45 1.82 -171 0 0 -39 1 35 19 3 28.8 22 330 21 -40 41 9 -37 27 4 -40 44 42 -37 23 52 1.82 -170 0 0 -39 11 38 19 3 32.9 22 329 22 -40 51 30 -37 36 51 -40 55 4 -37 33 39 1.82 -169 0 0 -39 22 22 19 3 36.9 21 328 23 -41 2 33 -37 47 19 -41 6 9 -37 44 6 1.82 -168 0 0 -39 33 47 19 3 40.8 21 327 23 -41 14 20 -37 58 26 -41 17 55 -37 55 13 1.82 -167 0 0 -39 45 53 19 3 44.6 20 326 24 -41 26 48 -38 10 13 -41 30 24 -38 6 59 1.82 -166 0 0 -39 58 39 19 3 48.3 20 325 25 -41 39 58 -38 22 40 -41 43 35 -38 19 25 1.82 -165 0 0 -40 12 6 19 3 51.8 19 325 25 -41 53 50 -38 35 45 -41 57 28 -38 32 30 1.82 -164 0 0 -40 26 13 19 3 55.3 18 324 26 -42 8 23 -38 49 30 -42 12 3 -38 46 13 1.82 -163 0 0 -40 41 0 19 3 58.6 18 323 27 -42 23 38 -39 3 53 -42 27 18 -39 0 36 1.82 -162 0 0 -40 56 26 19 4 1.8 17 322 27 -42 39 34 -39 18 54 -42 43 15 -39 15 36 1.82 -161 0 0 -41 12 32 19 4 4.9 16 321 28 -42 56 10 -39 34 34 -42 59 53 -39 31 15 1.82 -160 0 0 -41 29 16 19 4 7.9 16 321 28 -43 13 27 -39 50 51 -43 17 11 -39 47 31 1.82 -159 0 0 -41 46 39 19 4 10.8 15 320 29 -43 31 24 -40 7 46 -43 35 10 -40 4 25 1.82 -158 0 0 -42 4 41 19 4 13.5 14 319 29 -43 50 1 -40 25 17 -43 53 48 -40 21 56 1.82 -157 0 0 -42 23 20 19 4 16.1 13 318 30 -44 9 18 -40 43 26 -44 13 6 -40 40 3 1.83 -156 0 0 -42 42 37 19 4 18.5 13 318 30 -44 29 13 -41 2 11 -44 33 3 -40 58 47 1.83 -155 0 0 -43 2 31 19 4 20.8 12 317 31 -44 49 47 -41 21 31 -44 53 39 -41 18 7 1.83 -154 0 0 -43 23 2 19 4 23.0 11 316 31 -45 11 0 -41 41 27 -45 14 53 -41 38 2 1.83 -153 0 0 -43 44 9 19 4 25.0 10 315 32 -45 32 51 -42 1 59 -45 36 45 -41 58 32 1.83 -152 0 0 -44 5 52 19 4 26.9 10 315 32 -45 55 19 -42 23 4 -45 59 15 -42 19 36 1.84 -151 0 0 -44 28 11 19 4 28.7 9 314 32 -46 18 24 -42 44 44 -46 22 22 -42 41 15 1.84 -150 0 0 -44 51 4 19 4 30.3 8 313 33 -46 42 6 -43 6 57 -46 46 6 -43 3 27 1.84 -149 0 0 -45 14 31 19 4 31.7 7 312 33 -47 6 24 -43 29 43 -47 10 25 -43 26 12 1.85 -148 0 0 -45 38 32 19 4 33.0 7 312 33 -47 31 17 -43 53 2 -47 35 21 -43 49 29 1.85 -147 0 0 -46 3 7 19 4 34.1 6 311 34 -47 56 45 -44 16 52 -48 0 51 -44 13 18 1.86 -146 0 0 -46 28 13 19 4 35.1 5 310 34 -48 22 47 -44 41 13 -48 26 55 -44 37 38 1.87 -145 0 0 -46 53 52 19 4 36.0 4 309 34 -48 49 23 -45 6 5 -48 53 33 -45 2 28 1.89 -144 0 0 -47 20 1 19 4 36.7 3 309 34 -49 16 31 -45 31 27 -49 20 44 -45 27 48 1.91 -143 0 0 -47 46 41 19 4 37.2 3 308 34 -49 44 13 -45 57 18 -49 48 28 -45 53 37 1.95 -142 0 0 -48 13 50 19 4 37.6 2 307 35 -50 12 25 -46 23 36 -50 16 43 -46 19 54 2.03 -141 0 0 -48 41 29 19 4 37.8 1 306 35 .. .. .. -46 50 23 .. .. .. -46 46 39 2.24 -140 0 0 -49 9 35 19 4 37.9 0 306 35 .. .. .. -47 17 36 .. .. .. -47 13 51 6.30 -139 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -47 45 15 .. .. .. -47 41 28 .... Uncertainty in time = +/- 0 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 563-021868 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 54 40.4101 DE: +22 27 16.364 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 54 40.4101 DE: +22 27 16.364 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9) Metis asteroid class: approx. diameter [km]: 170 approx. diameter ["]: 0.131 distance from Earth [AU]: 1.78710 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#134 date of fit: 2023 Aug 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.004", 0.002", 83.315° remarks: * orbital elements for (9)Metis : Mean anomaly = 348.8487383417 deg Arg. of pericenter = 5.7461878388 deg Long. of node = 68.8684826305 deg Inclination = 5.5779070251 deg Eccentricity = 0.1231201954 Semimajor axis = 2.3865853149 AU Perihelion dist = 2.0927484645 AU Mag: H = 6.32, G = 0.17 Epoch of elements : MJD 60212.79284722 TDT (2023 Sep 25.7928) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Aug24,9.89,2023,9,25,19.027316,0.095899,-0.868195,9.620207,1.059747,-0.005303,-0.000027,0.000000,0.000000 159.2768,22.4597,-107.49,-0.98,False UCAC4 563-021868,5.91122499,22.4545456,0.00,12.27,0.00,0.0,0,,5.93501707,22.4597170,0.19,0.00,0,0,0 9,Metis,10.45,169.600,1.7871,0,0,3.415,5.22,,10.6,0 0,348.6368,2023,9,25,5.7462,68.8685,5.5779,0.12312,2.38659,2.09275,6.32,5.0,0.15 1.017,0.0043,0.0023,83,0.0049,Known errors,-1.00,0,-1,-1 20230925_021868,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org